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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c398033956fe967801638155b2023159428047f3e738592308b44effe9076133' 
  AND token = 'dOeRPUD0okWFHCm6XMHnQmig9pGwjNCAFtnUrCk+80o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}